Cooling machine



FIG. 1 shows a front view of my design for a cooling machine;

FIG. 2 shows a side view thereof;

FIG. 3 shows an opposite side view thereof;

FIG. 4 shows a rear view thereof; and,

FIG. 5 shows a top view thereof.

The bottom view forms no part of the invention. 

The ornamental design for a cooling machine, as shown and described. 